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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c44f2a602570f3388e16c9bcedfd112c36bb9c626f7174791d5034e8c54fd0' 
  AND token = 'wKsDEaqkF+Rr7eanbllQlQhbxvVISNrORZXOcDhYv6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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