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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4277acbbc8c17a0be3f1e32c14fdc9373933d4c934842e95e1bbda7bd92f961' 
  AND token = '06LxnX9/xfjTQlU5sEU6ykf8dHXRIoFm5LvE1YSmAzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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