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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbef58252e39da239be05bc4ff02ed583c9cf766c62e43879dfe961ff0f761aa' 
  AND token = 'QIv+WuWZA1zDliM8l+g75vMHFF0oobtS1K9NMcip1DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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