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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fda662e2620cdd6640be550cca3de2daa0e443bfa0499da7dcc025aac71156c' 
  AND token = 'Y6uhtn2kRMYAIPGmPN5TppEWTch05K9v7YCiQ/ZamNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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