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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205fd7906fbdd02be37dc2fd0390d17bcc700affd60c606305a29c9ca33d4adf' 
  AND token = 'PgOiXtxW8f82mESLU5wtIPDubhjWUMLhnB2H6Fva/gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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