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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa20bae0be76805052ed3133539f09fc1344ec34902f1793972d0db63b553b5' 
  AND token = '+U59nAD4oXsP1ZdicNqEOT+TE3JTtROjP1E+gTJHAcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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