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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c19af901ff7d5ef6d1756bdd9a201edc4afb573846f379bcf50ac9c3da46cd' 
  AND token = '0OsH54dD8I2oFPWJ41r6sd7oKVeg4FTEd7z4QLlZJ1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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