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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25114446bef1ce3d68647c5464e73b0b3b5ac0cfe7a6bcff59359057c80dd04' 
  AND token = 'p/ackP/TKopjdR5uPAeLwJTcuLL5L1YOtgRjzjPOIPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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