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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2528c36469957788561bc5778834908951be15b88178af0be999ec99eff2b95' 
  AND token = 'alqddu77JXnvy1V/bRX2fSNBA6bMCm9IG/7RDfZB2sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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