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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7017f3cc3e1845498fc6ecdf2a474b29835ea3df7ec3c3817cd414d44b3d65e3' 
  AND token = 'R0U4oOXK4vuHl7immkEyvMIFauCJ6SAI4jRYuwI8p9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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