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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa5525efc11a9eb2c59c1bd8e846749bc98c3a49ee625c0b22197be50ef5de3' 
  AND token = 'nji2GaRxsEKEbdEFKXJLec/6udhgELNhvJTy0yGrfXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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