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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58362c8c732f783da11e95d312d1f941b3fd6edeedf832dfe6c39363408dd3f' 
  AND token = 'gWdw4cIBeuBkMQWX9CYK3g2KGOHc9fVomI5i/3hcSM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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