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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b873e63c1917b886092020e923875d89056d609958e22362a493e1a0721a139' 
  AND token = 'vB1SXz8MNJfXC5xD2mY9bMzgwdLktldjfqAZ3XcwpbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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