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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238a23021268d0c40049051c4e19216b65d4e771ce4b4d2871ed6868fd4e717e' 
  AND token = 'gJT3qm/8t9KppRAL1o9VkvPGGT3s/ebYH5GtewryNv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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