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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff355a0220b675250c7be5fe91ea79f2142bb1ff4a2196e5ef8a8588c463b16' 
  AND token = 'Twx9MI+zIPZFbhq6ZK9EFc/7I/3VpEdNfiG/ct1G3Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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