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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab6b3cf76792c3cd6a7af8d3a7c9fbffdc490b9001b7c071edca62e4a8cf26d' 
  AND token = 'U8XU0JNTBJvRD0R5bW7DI4XRF2jb+F38SvhwR60atZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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