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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262983a144b76ef5b0a31f9536dd5e9e8884c06d52eb61568e8d24f5cf05da06' 
  AND token = 'zXUduQcczdDq48wCHowlTYBFCvO8ZDk7SUeD4aNwe3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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