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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bef65042a55a1c2e18da6e9aa76ecb55b47d007dec0b48dcdc79bfecd3e0b78' 
  AND token = 'D+/pXosNVYSRa7Rajx6sIyvvnyHr46UTOkdhPtClJLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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