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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c74be56218d0450cb9db72c868375d10ab2298daff242b9814e8f8c3c00b35c' 
  AND token = 's/sKGFIXuxv7JEJTKxf7GrQbDRfrfBPKewynIUTKJdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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