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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72974a85d781c3bdea1cb5807a4898816e65302c25e7123d50fd8d3484dc96dd' 
  AND token = 'JAdwlXIF/q2JNAchNWOiuZ3zNjCeRYAmgXnfzenOcvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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