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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062a8bb2bae42d8ba048b2771f1943b4c17366bda203ef52deb1c318764217a2' 
  AND token = 'q8yIHPctzsn1GcCUaBEEASh36rj0nssGxOfSR7QqBKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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