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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a87bb1e4c7276b1ca2174c7fb701611881f3f32521b2af49a160643f6d7b94d' 
  AND token = '4jlpAw0zPPQftGOn8bjNnPFdUWEu0Nb717B0epc2kgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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