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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1518e5fb7625f8ad1450174d19999daec86b90888d2756b8f4e80c8c83fdf32f' 
  AND token = '3xW8MfmlIHZNXmvbMc1I8+Q/d+t3Qiw86kcCS68ndDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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