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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93a2271403b94623b27a09c2dc307f1cafea0afa79e82dcf7235d0a5675a507' 
  AND token = '/SA7ZeHiuwT+HzDP+IN3h4/vMT3mWJozqV6e5CVRWQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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