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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9549063700f6bec8c52b46321d6722c95627ac32faf95260311df0c8be1c06' 
  AND token = 'mnFG+0xjuSO7oFkDyQO2ot2hLrP4eU7mSl/UiO8gRWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}