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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0c9cc359f21845b91f5dc571ed4af7a76c63582c5f0e02289cf10f59cfd8ea' 
  AND token = 'XkzJG81RLyrNgw6EFRLZWdh7wsbRMUvOakUVar3lLtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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