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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c609bd446daa42006ba4204c7a1192131f9e36a6d576586266d9d8e4809720' 
  AND token = 'rGLWxiNi0gWEjdxPk/O2TMzVtXvEKS8PqlFp5R2ogOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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