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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c0a652873a83c83955c09d50209f0e579c01a2da0b6abb8465628eac1efab7' 
  AND token = 'c+FXH9I6cEEOhMAovMFUtp0Fzs4bCQ/+fzu22KNYFEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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