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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd313175e8243614d5decee5dac778be63709efe3b7197059f07a2c646086bdd' 
  AND token = 'Si+AO6xkCopdU4sFx/PUds5AoCOiNjc5K/J8v9xsYh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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