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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc4cbff156bacbb5d3bbb8f70ee7e5d07ac4b561dabc9fba58aff841c04d392' 
  AND token = 'iBEAXBrvC5QR4GejyTmVEJpB9L5G1vbl8DRfKyYywdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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