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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c36293b938311811cf76a6c17f6835342f0910bffacc7e3f1496b19d4529ff1' 
  AND token = 'I5iSnXr3djoD6BnLnP5u9bsau2QiFnMTsC/ut/5h+aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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