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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0379ef9f389b76ab521fa3a134820711c7820e47a5084b4c51f8e04ec81b52e1' 
  AND token = 'rFtzGX+nYKCuHAMW03sfevxA0LhToU0wjuAuhkV5LVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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