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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2a89e1a5588c136e949d066908efad66b6b6045883b9133b2eca57df007b7e' 
  AND token = '0OajR8ERT/La/r2wwMdPrvndND2nU3BFUVWSxRRFN2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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