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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2446ffbdf6d70ded123c2e39c92ea7a5515127de7c6ee8682f9a249d30d3bc03' 
  AND token = 'a9pogw+bsA+nFeYnB/pAswZoIA33dyJnAcphNOh1u94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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