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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8faef5bb182515a04cb19b543932e6a0d7d6a7808ce0858bcf0930b4805a770' 
  AND token = 'cT0QdOwmIFwiZUX9M4ryhql1Amc031Ey5muE9HPmMgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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