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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936c722920dc323977e9fe57d09f2d2953fc5352bb735d6d63d9ba0f2be02df2' 
  AND token = 'KOP4pb3MlYmbyoORQlEli0VQ6k1Fd76UtvobD6Fpig4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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