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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda303434540ce2dd9989391a0b735e7325ca72089cf684d59a7fcfedf5c426a' 
  AND token = 'o4fn2wJ5L15SDi5elHxF5Ee21TuhpufNM5WyfY8/a3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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