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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee6a6851a0291a0f546ce6199fcc50f50ca3a2fd6fbdb7fce09232949c2a4f3' 
  AND token = 'Bzby9W9bfR2kdhvD8AubjhM3I4Yc+Ah/ZnMu+I6eT9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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