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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52705c78730ba1ca9e737e220847965a40d9518b93d19e522bc81e320932c17' 
  AND token = 'bSH+/5yMyqlBxD0JGUvDDGR1P/qxtNBmm98m4et+lus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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