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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18339c1244a2a52bfbbffff28dfaa0d58095a352ddfbbd3ad28ca76faafe0fcc' 
  AND token = '4fwCx2muXr4bseR5C0FOCp7M6HYK8giB8MWrlF35OZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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