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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d82670703884fc32f56b5ad785240827715b3b2bbeeb0b5db0db95c09db540' 
  AND token = 'wPUEc7551m5TguRCXcy42SWX6S2a5HmkTp4C0ls4uVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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