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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84002be9346776472cbcc9187f3223e4b0417c1258dd4f2f49fd152b452bfa6f' 
  AND token = 'lG4Sy9oCe5ri30wKJWBTeyzUkIae/FlLuVO8GT05+qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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