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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4479cda7c20720c36473b92d2f594a682029f117c5b10851e974f49e34f918' 
  AND token = '58O3L/c5RrR7UIVkZn4V5mV07ZjiVe8/h9ogFMpCPQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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