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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf435518d2ef1c028d28a91fc78bd732c2c9e1748d487db39c522fe52d5c518' 
  AND token = 'RRUJ7NCwPrdxjWncBPaxhw3qc5btMOGcwc9Ghvc6yJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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