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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8a4be8e61a7563b18a29268e1ac117e8ddc3334c0558df14ced844fc49ab5d' 
  AND token = 'JppC3aNoi6NkgXAeIssyITSt/tFzjZJifGF7Eia0rCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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