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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114b6480cbeba34695495ebdd96ad04d8aa369e6b5c05c78c32fb4e1adde3ec5' 
  AND token = 'kSniwKXob3B+P4m1SdvTFBcbWLNcgtXEf/6T/zQj8Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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