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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6615f380755e656a1e528dd7a78832bb81c7c4f5186ee64def9b0a4697de2d68' 
  AND token = 'YzF1b8GI/fXSTokO9dFPvB8+15McPbICQf3C3jvaMaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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