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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b363861a7cb80cd66df2a9a3913db5df05a3eeb86852d0a2e2d6124beed9cd3f' 
  AND token = 'QMqrRWwi/eeHGt0/Z0LtvB5Hut8LDpjova/qGHgvHEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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