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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30a11b5bc6c104362d6695e955b958b5ad437a9e0923ee4142cbf7fc99ef86f' 
  AND token = 'F7jEuQp57UYdxInMHWXUn07emsGEjuFqdMH2YnGESD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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