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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d41bec9f9e8f91cd930d3dc9bb23892ac5c74a7811d5cef20148ade565c80ed' 
  AND token = 'R5+IMcLX32y2UdsdCpw+lBxW/Q2FMEtS1cJnr0RSHwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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