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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fe7a5f16099b5b04ac5270e13025bb0785d28c6856c7652fe90c916c64efa7' 
  AND token = 'xIeTYpcs+98VDblp1C3KaSVSWMJlXySW9cy3q/P8+HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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