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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329dbd2a0d3057e54a8fd088d4e65c8fd26f4e9e66ee1017db97c50199a896bb' 
  AND token = 'A4C9UkwD8bNjRgr1QWjpKNt04k489Xnfk6mp5qnLdII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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